Mattress



FIG. 1 is an exploded perspective view showing an exemplary embodimentof my new mattress design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines are for illustrative purposes only and form no part ofthe claimed design.

The ornamental design for a mattress, as shown and described.